/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Selections/GeometrySelection.h
aFGeoSelectionIDinitialized with the given TriangleID and GroupID used as the TopologyID
static [FGeoSelectionID](API\Plugins\DynamicMesh\Selections\FGeoSelectionID) GroupFace ( int32 TriangleID, int32 GroupID )